Update October 7, 2026: This feature has reached General Availability (GA). Please see the following announcement for more information: Sending From Email Aliases – General Availability | Microsoft C...
Updated Oct 07, 2026
Version 12.0
Blog Post
What are you asking? The feature is already available.
See: https://techcommunity.microsoft.com/t5/exchange-team-blog/sending-from-email-aliases-public-preview/bc-p/4124467/highlight/true#M38886
Note:
RE: Exchange Admin Center > (Left menu) Settings > Mail flow > (Area "General") activate "turn on sending from aliases"
If users have already manually added their From alias in Outlook or OWA (as previously explained in this thread.) you do NOT need to turn on the setting above.
Assumption: If you turn on this setting, all users will see all their aliases instead of just the one they wanted / added manually.